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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63dc9b58fecd633cbabc091bedb4bd1e68a562ae2ba8347d873fc23659465d60' 
  AND token = 'SkVpAeNGmHQfggJtnyz7XEA7kcikZh/6kUQ8L3CVtNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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