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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bdc40bc55a917a84cb81707e0f45de2138cf69049a67a664d439877b13c81b' 
  AND token = 'HbvRyz2769jGU4ECDxMqZS1A8x9vHG8MO57s1sASsPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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