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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '291ccf4a8ace314543cfe78df621170595a5d5c4f29fa2081b521bf1a8d81c03' 
  AND token = '1ZbzNz0fL/Hb1ikGPMI6oyDJx00HEy7JcEInIvbxm84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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