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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ab76f87965d4c317a673443a68c65f59843a2d90b418c1a6c4d84b9e22ea1f' 
  AND token = 'TClUFukkgj/kdX4ll7SfEVUDoN3684gxaZct1JVtgwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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