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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1797cfd686d957311d059466405047acb48847170a5e97a155e07c4078fc880e' 
  AND token = '7siiO+YrPYC3rRJ6EMolDxl0dhha/ud5TevvBQYmvMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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