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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb979ea734bbf0495bc7e941826ffd0c940af4387521eef47e11e2601a3f21c7' 
  AND token = 'V1fDNPn+w/9d3zUO5cQ/hfzGWQS2c2kFgHvLljrO0Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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