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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd076d1a763f12a3c6fbe5c9346e40437d060c7a88cb3f379dee0cc781b7a4a55' 
  AND token = 'v5nqhVzp9LN4hyhi9Yc6u4JrNcxZs5Fi5Pu+C/asmqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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