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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98737bd1f05abac369abe013d27a8f2674a22098b2311b5ea973053437bda09a' 
  AND token = '6LwFu3S6etDv52c0aKblt5+aFJxuq/CLkOp6m5vNB9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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