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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9b6aa8695175aa3ea711b2ef97915a7dd7dd4e5c461b915a693fa9904acc30' 
  AND token = 'sZ0CsOjpJuCPC7wKJB978fwJSQudpr2jfd61wM0+F5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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