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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ef4b86722b6dc16de471d1b13172bf9f5ba836fcf3bee1a0dff8309df8e0e7' 
  AND token = 'Kt3qSyChehnXlSoIu0Ko6ZOkqsXf8fe9ZHUtnrlNHig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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