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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90df7f5a40a1ad8a5800da6ddef92cc34a4c41203811f5bd5b08b1cfbcb3817c' 
  AND token = 'e5uKtnpFGKWJI9RUmOkbiI/u0g4MWjzKFbkCiosiwIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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