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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d06cb7bb1ca36edf43a1149f16dcc57b854b9512e38c99fe76e8d8b2080a58' 
  AND token = 'XSjkQjX0X3EWd/pDRutCnFl0ICZa8/fUcqc3Bm9xeYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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