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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c4aa22a22e552fff48a790112ca61b7e33b0f3efaa97c5df8e4d3983dd3711' 
  AND token = '4+/H7u+EPNjSUL4QiED220T6JjS6RnNcr0n+00tPA20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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