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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c1fa8718765ccffed231ed94ca4e85d2aef80c5991c63ba992d011119e17c5' 
  AND token = '70uC+K6pyX0X3ZvJZQv3IYkrsHBgmxgZajS2D9rXfpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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