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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bb4f80350973f89beeb4ddd95438fb93e64857dda516e863eb6878b13b4ef3' 
  AND token = '9zZyCU3WwZVtpzcwhqDDe9dX0RTa58zlCbKC0Ao9VW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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