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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a66b2fa18db7092b0170c368626c2ef57bbce6a6df85c979ab20ab7d8af2827' 
  AND token = 'SRxpCKhmm6QK3yZSQLi+9OMy2Qig3oY65BWClrVveJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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