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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7a5f45c873d3edf26b408645367e69dd108a2684ac71c6dbd65f3d33403803' 
  AND token = 'yBeYtQxGtI/Fr8iJjJFUptyx9jwYj79kwnJzl9O27Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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