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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d9dc53cf53fb73738107bd171baf467c5756a1aa07c6df73d601708a9ed892' 
  AND token = 'Bve1kN/lF9TxbfYbm76pDQ9EpkvZ9qabZjpUTv6bvjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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