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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5d911f24df8a904dafb1edea93d4be334b5d0654a8576e395b43dae8ad4888' 
  AND token = 'IBwrTc/Z/K80kiwYCYNqbuBh6JJexpj5CwZ0L/iRqvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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