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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b2780d1501185a527219d50a4e3f79b0771e8a26d3595ee628b8dfa1d54414' 
  AND token = 'RK+KNNzHHCwiA8Av2yjU4ZI9RQzcHey/FELrGocaDVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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