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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca70d43ee239113129200816ee92a64b6e8f0fc4c0e9a2e7ec84f4c2e8acf2a' 
  AND token = 'iDkj3O99kjSvmt5QloCwrXkujcNB8kB7sKuFZ0xKBqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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