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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbf3ec1ea9b5b0c0d55dfb626e29eebe23142c75ecd0468b3fd8ebf410e2a6f' 
  AND token = 'ZjiLrKREO8Xi3PHqep1MhK9DaJhqlywPPo28yGXL42Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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