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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037b184c071ba763b418a5a99666c3468f7d1d95eb93ef6dfc1ceae60405ee45' 
  AND token = 'PPQyEvAmElUp0P+mSrQl/cf3rQizfUTTHNZ+BGXMhWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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