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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e42b423206923626940534a31b26e42ee55b99bc124fc7711efd22526dbbd7' 
  AND token = 'Z3MTaz+XmAYrlqwbFQt+jwvjK6+/XwiO8bXXj6AYt5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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