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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece556daf0cddb2c58e8afbc9f4b5c83dca3d3ce80ec45e67bb23738c04a98b6' 
  AND token = 'A+D5mH0m3CjVs5/GDFGkqSQkvOVPuZ2nqjr7xl68MKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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