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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb004dfbaf33dd5a9806968c9a0e6b2862658cebb3ed64c605411c9e085d913c' 
  AND token = 'mFqK2XkHoWFRBvhlN9WkzGOr2kk+Hls21fjd5h80M1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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