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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccba1ebbf817f2322dd90c9faae10af90c0d746ad7a1170dee1b61d7f3046564' 
  AND token = 'x8GxpVpR9q50sJduYLcaX1RuO9yNaGFTCrYBoo/F2lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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