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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f45adb49ddcaf25e9db01b661a0d424894f38b610bcd8f7c7cd915b86442c91' 
  AND token = 'yFPdoTjJfo2S8DZ/yTcYNhdwUr51N44YpJ7ILnlIXCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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