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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07229b36be539950189be279cbca602ccfc7809ca53bd21fefddf64dbaa79ada' 
  AND token = 'y9ABPOOXN/1EpWBt0ksOffbaHq9S0mFV4U/PbIN4mys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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