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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cfc554649c8e518858880003b1ca74cbe0d24d336ec9c2d95050ecfd3cd6b23' 
  AND token = '8ogbAGmmVubI2E/e4imCbLwL1fD4WdJkFqk+Squw7Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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