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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a512033695b222badf535c5a1850da0235b6ed1b31b36fbf071eb04e44664e3d' 
  AND token = 'eUAGXnD5a6Muns44KXNAS3TfpjU5FvuTYUTVFOY1iOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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