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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafe7d8f66ff9322e9822b8c0928fd7b6eb5827054d43543f98701e7f0f04c00' 
  AND token = 'JGAEQw5djhSUKcNC5w8FmIMuu2RxpkU51ovt+/Z4N58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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