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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74873eeb598d7ae000b989e0ebea5aef4f9e51e491f64cf172a72e86b4316194' 
  AND token = 'AMb2ZJq4hu/1Kl9KvM+vknAozYYYOTZaL721gT8HT+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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