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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1c11715a8edaaec1b763d792396c886077a1f4516c5ee2939ced597a21f3e1' 
  AND token = 'RbsqLXV6fSEi/6PW4pUS39L86x/1vbmflKBTgQx2D+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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