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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9062d7fbe4f9d3b7056a03fb9f53bc48468095ad87ae8d83cc0229607fc41f39' 
  AND token = 'yA8R0mswK4yiOr4js7Kk83zgjgR9aTbXh/XnLoK43lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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