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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1afc3edbe05975d021798287acf34c19700586c2e087cda9d06fdd94c74210' 
  AND token = 'WEDsRyNMqztVtopRPvzi6v/DQDqpyioDxm6uXTp1SMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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