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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f423ec16c611e9c27d9396c54631831f89476421c04c33c15454abed98cfb2' 
  AND token = 'HyLELZ/XbcKjHFFhe2DGcTnAgs0KbpCALcD6r5vUohs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}