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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b55be318ee944a3a670a1dbe95319eaea8c2b1bd49e1b5db50b6f873fe572fb' 
  AND token = 'uMtwYpODZsPzd6lfcFYsvcgF4ITJCxUiLnLkT99V7Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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