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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ed98eb18e9afef3a9f5e8ddf25e82aa54d4e31ac510b9215945aad5fedf105' 
  AND token = 'dBdPr3RUE8Mt1cEb/O3BY4wkfHE3L4yholzVy1ohK1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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