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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64327cc057e67d446cc8e0334939c5fbc319b5df4ed544ba6f1979f29c4fb33a' 
  AND token = '8YEfgpCLg7iQjJQuGaz+EN0F4LMk48pVZF+f9HyOza0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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