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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283bbafb045dc308ae8f4709fa9ff86f077409a900fe6f67c54e84e523207542' 
  AND token = 'u0Q+jdJMOjNnVP2mXSDfSj9MDAEoi8h6Cz21rvdaSWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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