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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140db01761a0ef8e802212c91373bfd0c45aa7c52993be5b0f8f907f711bc6a4' 
  AND token = 'nru6eQfWSLFnBc0zTL6DzO3iQsfpFkCcKoLQWVQhFko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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