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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7bcf7756c9bc04d27b6267555f1cac8b43de72d99bb4b6b59a9e843714bb3c' 
  AND token = 'xA19C82Dsb8BNRD+jJXSymsvX+97dkV+l+gIDmvZINo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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