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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ee453e965c994258ff1f6b70892d91ab7227b719d97144fc4551c7ffa8b33b' 
  AND token = 'hgnC6MBnIAgLH7564PY36LiS8nDb4q/+axYJOFIoO0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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