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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94c81907bf25c1cd38287eb48c19244ebf7600e1760ce5f60599f5eaa7adc28' 
  AND token = 'PD75fUfn1GnXAuIus4hSu/LiBuRZz6Dx1VDZBKAjVKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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