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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10861a111970cebe7de9db70e62491303e62c7acc78f2b5cb400365545bbedd4' 
  AND token = 'gJnKD7z98ZJGXzRY4V4kP67eE/3Mp9wpLZYwbQMRQXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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