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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba844dc5e1117a4bcdef682a4405e479643a1c2c1f9b42580eb418bd479349e' 
  AND token = 'bYEO8DIY+DIKXapIofkYrs/PrP6MAFW5J6NLwty+f4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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