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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd584f79fa7a8c13b086edba1f26afea8882bef5f87059ca78f1b5b37871ce0' 
  AND token = 'fSCyxXRezo7q62DAgmFFzbroW15xvz3wFSSFRo9fc0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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