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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb954de8f9de178596cc2e63062fc73baf72e3c4d1729958e283349668ed6dfc' 
  AND token = 'K9i1vDl2fV6zIwkQLNQFrTcYSi7XaDNoRtkfU7CNOYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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