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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6987bdfca9016fba732b8f257408ff417c1696cba5f0c30e1f8674bbf8b3ef' 
  AND token = 'fZ31He69nGWnVQwfUlP2/PLkwaK2VsFN1lPkXLBON1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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