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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3717821dbd5afb01084bebc3be3595c5b9d691d1aa56b97d898dc6f265af769' 
  AND token = '7sN6okIiCIiB+8xedhVBpgFg5Tv06Y5q2l0AuW0dw+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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