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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc941b34bada443a4d9f9d5b168b7b0f287e0e04f283a2c1d062b9ceb2004cd6' 
  AND token = 'i1s4GSzwqE76778AghONpNFMMLI9/XvYXGeOdTcxkxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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