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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432b6ba207697183f043d936e4e6acb5f60ae86244b9671c9083ee476e983db9' 
  AND token = 'oAynsRth6n68IfPAiEJUmAduV245ACSzw6Q5HUs+Ajg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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