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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4337ddb66342a5349c450154800a24556bf08878424338cf60b7245dd0cccfe8' 
  AND token = '/mcc5lV9+tuKLjrTAnVzOvlpK8cn+OydDymR/ozal2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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