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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febfd3aa9cf097722a6b80174fb6de12dca669af2576715a83a05919fdae5586' 
  AND token = 'rz/8cntPMJGj+omU75RvMnJf39g3qDbbQO0lQjvzA64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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