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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a72a3f0c1b821e79c5e2563c0feee612266a04785858fc2ce39afb924ce2be' 
  AND token = 'cA8czC0lZIYANtr8ec60tXyiBo+H5vSvmHHINTrOp0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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