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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c475d91e4c8b6c0e2f9fdd09a096c35a124e7626257fc976847369e5bf73cbff' 
  AND token = 'aNu4dG3QqJ4jkHMkXlltyp2irLko8x2qCC4wqyTckmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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