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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6eae873d43c7a1b3fa88178f27580bd1d56a57ef8efc6ad44b56fccc0c35f8' 
  AND token = 'hO6ayVDx+I0jwanDQhdqswtSykMNksb1rAabchBS7gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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