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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ee9a35bdce9a1c85df8a9f173b68ef03df23e191d399638697e3f113dc9b6f' 
  AND token = 'qjGIXle0O6Uj1tZUtGs+vDfLQXAtSRB49t31Xg4CE1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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