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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234757c1791de8d0fa2c291f43f33d8ceb3d83f518f044f523866dd3cebfaa67' 
  AND token = 'EvD4CNuLATzF6PhxbRaOV5Mo0HBns8104qW3qn00IUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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