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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a897148230ecdc49a2998c65efe2a61736df062db3ddbff840e583e42080b8' 
  AND token = 'htZC8xi0tfrMv6JHADecZzhiZxRJ+2jr4+zMyyGKi5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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