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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43e687d5eb0ab5d611b3c408d828e6b9d87d3d053f1bea7a76264b41853524e5' 
  AND token = 'A64boxTzDaGANO9YWFelEI5rrl9xHri7fMkAyNBkvjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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