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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e203baabad7bfeda5dddc16e753fcc3ff9621e29b25727764d9b2afc30bcd993' 
  AND token = 'ELz/iJoZ712kwNvQSs6P0JyeR2DHZBGpbx8BUJClcQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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